Machine for cutting rubber rings.



L. J. PIANARGSA. MAGHINE FOR CUTTING RUBBER RINGS. APPLICATION FILED 001'. 9, 1908.

913,558. Patented Feb.23,1 909 m w 33% \v w W w a Q Wm z 6 N Iouzs JPm M T0560 .L. J. PIANAROSA.

MACHINE FOB CUTTING RUBBER RINGS.

APPLICATION FILED OUT. 9,1908.

Patented Feb, 23, 1909.

2 sums-sum 2.

LOUIS J. PIANAROSA, OF BOSTON, MASSACHUSETTS.

mcinnn non CUTTING'RUV'BBER RINGS.

Specification of Letters Patent.

Patented Feb. 23, 1909.

. Application filed October 9, 1908. Serial No. 456,876.

To oll ivhom 'it may concern: 1 Be it known that I, LOUIS J. PIANAROSA, a cltlzenlof the United States, residing at Boston, 'in the county of Suffolk and State fFigiI.

of Massachusetts, have invented an Improvement Machines for Cutting Rubber Rings, of which the following description in connection with the accompanying drawing,

is a specification, like letters on the drawing re resenting like parts.

his invention relates to a machine for cutting rings from a tube of rubber or other material, and While the machine may be used for cutting rings of different material and '15 for various purposes, it is particularly designed for the cutting of rubber rings, such as are used in the sealing of fruit jars.

It is the object of the invention to'provide a machine which will perform the Work entirely automatically in a rapid manner and leave the rings with smoothly cut surfaces. Anim ortant feature of the invention resides in t e rotary cutting knife which is.con-- structed with an eccentric cutting edge, so that as the'knife is rotated it gradually cuts deeper into the tube until the ring is severed therefrom. This construction of knife also enable's'thelrelative feeding movement between the tube to be out and the knife to take place at that period of rotation of the knife when that portion of its edge of least eccentricity is adjacent to the tube, thus enabling the machine to be run at full and constant speed vthrou hout its operation.

The nature of t e invention and its novel features will more fully appear from the accompanying description and drawings and will be articularly pointed out in the claims.

The rawings illustrate a preferred form of a mechanism embodying the invention and designed for use in the cutting of fruit jar rin s from a tube of rubber.

the drawings, Figure 1 is a front elevation of the entire "machine. Fig. 2 is an end elevation looking at the righthand end of Fig. 3 is a detail illustrating the con struction of gear on the knife-shaft. Fig. 4

is a detail in cross-section showing the relative osition of the eccentric knife-tube and man rel at the time the relative feeding movement takes the bed or table C, by bolts. These standards'will be placed at a distance apart determined by the lengths of tube to be cut into rings, and for convenience in illustration are herein shown as close together.

The main shaft of the machine D is journaled in bearin 's in the upper portion of the standard B and carries a pulley D by which itmay be rotated from any suitable source forming the end of the shaft D, and the other end being centered upon a centering pin A, carried by the standard A in alinement with the shaft D.

The centering pin A is movable 1011 i- .tudinally in the standard A by means of t 1e lever A, ivoted at A to the standard and connecte by the link A to the pin. This allows the ready removal and replacement of the mandrel. The centering pin is -locked in position by the set-screw A".

shaft G is mounted arallel to the shaft D in alined bearings A B in the standards A and B, and serves as a guide for the knife carriage and as a means for transmitting the power to the knife. This shaft is driven by a gear G mounted thereon and intermeshing with a pinion D on the shaft D. In the construction illustrated the re. lation of the gear to the pinion is as 6 to 1, so that the shaft G is rotated one-sixth times as fast as the shaft D.

A third shaft H is mounted parallel to the .to be described.

The knife carriage by which the knife-is supported and moved transversely of the mandrel to give the-relative feeding movement between themandrcl and the knife whereby the rings are cut one after another, is shown at K, and is guided upon and mountedv to move longitudinally of the shafts G and H.

The feeding movement of theknifc carriage is secured by forming the shaft H W1tl1 a screw threaded section H fitting internal screw-threads in the knife-carriage K. At its outer end the shaft H is' rovided with a ratchet-wheel H A aw carrier H is journaled on the shaft and carries a pawl H engaging the teeth of the ratchet-wheel- H The pawl-carrier is provided with an arm H, carryin tial rotation of the pawl-carrier and the consequent partial rotation of the shaft H, depending upon the distance that the arm H? is moved by the striker. The awl-carrier is provided with a second arm engaging a compression spring H, sliding on a circular rod H held fast at one end in an arm H bolted at H to the standard B. This spring thus serves as a buffer and as a means for returning the pawl H to its normal position, a nut H on'the end of the rod H serving to limit the return movement.

The strikers for operating the pawl-carrier are shown as mounted. upon a disk G carried on the end of the shaft G. These strikers comprise rolls G carried by lates G adjustable radially by means 0 set-- screws G, upon the disk G and it will be seen that the distance at which these strikers are set from the center of the disk will determine the distance through which the pawl-carrier is swung and consequently the distance the knife carriage is moved. Two

sets ofstrikers are shown so that the knife carriage, in the construction illustrated, is given two feeding movements to each rotation of the shaft G.

The rotary cutting knife is shown at M, carried by a'knife-support mounted on the knife-carriage K. The knife-support is constructed to allow the adjustment of the knife bodily toward and from the mandrel,-

and also to allow of a slight angular adjustment of the knife to insure its correct osition in a plane erpendicular to the axis .of the mandrel. The knife support is, there-v fore, indicated as made in two sections. The section 0 fits over a projection K, of the knife carriage, and is rotarily adjustable thereon concentric with the shaft G so as to enable the knife M to be brought to the desired position with'respect to themandrel; For this purpose the section 0 is split and provided'with a set-screw 0 whereby it may be locked m position. The second section O is formed with a pin or stud 0*, .pro-

jecting at right an les to the stud K and entering a split soc et 0 in the section 0.

This socket ls-provided' with a set-screw O,

. thus allowing-the section- 0 to-be adjusted bring the knife M in the desired angularclaims, with respect to the rotary knife, are

rotarily therein and locked in position to position with respect 'to the "mandrel.

lies at its end a pinio. P, a gear G- a roll H", which, when. struck by a suita hle striker, causes the parother.

on the shaft G, whereby rotary movement is imparted to the'knife.

he pinion P is formed with curved teeth, as illustrated'in Figf3, to enable the" angular adjustment of the knife to be made. The re lation of the pinion P to the gear G7 in the construction illustrated is as 1 to 2, so that the knife is driven twice as fast as the shaft G- is rotated.

The knife M is formed with its cutting edge eccentric'to its center of rotation, so

that the cutting edge penetrates gradually from the exterior of the tube to its interior in the cutting operation. The knife may be formed in various ways to secure this eccentricity, but as a preferred form of construcwhen in its rotation that'portion of the knife edge of least eccentricity is adjacent the tube carried by the mandrel, as indicated in Fig. 4, where F represents the mandrel and T the tube of rubber. thus take place without interfering with the rotation of the knife and while there is no cutting action;

In Fig. 4 the action of theknife in cuttin will be seen, the knife having penetrate part-way into the rubberftube T.

In the preferred form'of construction described the arrangement of the gearing is such that the mandrel rotates three times to each rotation of the knife, and one ring is'cut off at each rotation of the knife. The operation of the machine will be a parent from the foregoing description. T e centering pin Afis slid out b the lever A", the rubber tube to be out is p aced upon the mandrel F, which it fits snuglyv the mandrel is placed in position and locked in the clutch D, the centering pin is slid back and locked by the set-screw A". The knife-support is The feeding movement will swung upon the stud K until that portion of the knife edge of least eccentricity is close up to the exterior of the tube, the knife-support is turned 11 on the stud 0, if necessary, to

bring the p aneof the knife exactly perpendicular to the mandrel, and the parts. are. then'locked in position by the set-screws O O.- The machine is then started by power applied to the pulley D and thenpro'ceeds to sever the rings automatically one after. the

The terms eccentricf and eccentricity .as'used-in thisdescription and the following to be construed as a plying to any form of edge, whether circ er or irregular, which .tnbe to its interior during the cutting operatron.

' Having described my invention, what I clmm as new and desire to secure by Letters t ve transverse feeding movement to the knife and mandrel during the rotation of the knife when that portion ofits edge of least tating eccentricity is ad acent the tube.

2. A nng'cutting machine, comprising a tube-supporting mandrel, a rotary knife having an eccentric cutting edge, means for rothe knife, means for giving a relative transverse feeding movement to the knife and mandrel during the rotation of the knife when that ortion of its edge of least eccentricity is a jace'nt the tube, and means 'for adjusting the. extent of said transverse feeding movement.

3. Airing cutting machine,- comprisin a tube-supporting mandrel, means for rotating the sai eccentric cutting edge, means for rotating the'knife, and. meansfor giving a relative transverse'feeding movement to the knife and mandrel during the rotation of the knife when that ortion of its edge of least eccentricity is arfjacent the tube.

, 4. A ring-cutting machine, comprising a tube-supporting mandrel, means for rotating the sai mandrel in a direction opp'ositeto the said knife and at a greater spec. of rotation, a rotary knife having an eccentric-cutting ed e, means-for rotating the knife, and means o r'giving a relative transverse feeding movement to the'knife and mandrel during the rotation of the knife when that portion of. itsedge of least eccentricity is adjacent the tube. a

5. A ring-cutting machine, comprising a tube-supporting mandrel, a rotary knife having an eccentric cutting edge, means for adjusting the knife bodily to bring its edge -of least eccentricity close to the tube to be cut.

'6. A ring-cutting machine, comprising a .tube supporting mandrel, a rotary knife hav- I ing "an eccentric cuttin edge, means for adjusting thexknife bod y to bring its edge of least eccentricity close to the tube to be cut, means for adjusting the knife angularly with respect to said mandrel.

7. A ring-cuttingmachine, comprising a tube-supporting mandrel, a rotary knife have ving an eccentric "cutting edge, means for mandrel, a rotary knife having an' rotating the knife, and means .for giving a transverse feeding movement to the knife longitudinally of the mandrel during the rotation of the knife when that portion of its edge of least eccentricity is adjacent the tu e. 1 8. A ring-cutting machine, comprising a tube-supporting mandrel, a carria e mounted adjacent to and movable parallel to' said mandrel, a knife-Sn port mounted on said carriage, a rotary linife mounted in said support, means for rotating said knife, means for giving a feeding movement to said carriage during the rotation of the knife when that portion of its edge of least eccentricity is adjacent the tube.

9. A ring-cutting machine, comprising a tube-supporting mandrel, a carria e mounted adjacent to and movable parallel to said mandrel, a knife-su port mounted on said carriage, a rotary knife mounted in said support, means for adjusting said support on said carriage to carry the knife toward and from the mandrel, and means for rotating said knife.

10. A ring-cutting machine, comprising a tube-supporting mandrel, a carriage mounted adjacent to and movable parallel to said mandrel, a knife-su port mounted on said carriage, a rotary ife in said support, means for adjusting said support on said carriage to carry the knife toward and from the'mandrel, means for adjustin the said support on the said carriage angu arly with respect to the said mandrel, and means for rotatin said knife.

11. frame, a tube-supporting mandrel carried said frame, a knife supporting carria e mounted on said frame to move para el with the mandrel, a shaft journaled in said frame parallel to the said mandrel and having screw-threaded engagement with said carriage, a rotary knife supported from said carriage, a second shaft mounted in said frame and having driving connectionswith said knife, a pawl-and-ratchet mechanism mounted on said first shaft, a striker carried by said second shaft and adapted to operate said pawland-ratchet mechanism upon the rotatlonof the second shaft.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

\ LOUIS J. PIANAROSA.

Witnesses:

hIABEL PARTELOW, 'FREnERroK S. GREENLEAF.

ring-cutting machine, comprisingba 

